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but in these very rare cases, it seems to create antibodies against platelets. they start to clump together. you get low platelet levels as well. and the fatality rate initially was much higher but it is now something like 17%. there is some suggestion that there is a slightly higher risk in women than men but it is not absolutely clear, and slightly higher incidence in younger people. and that is why initially thejcvi, the body that recommends what vaccines go to which age groups, said ok, not going to give. we think that people under 30 should not have the astrazeneca vaccine, and that policy was introduced. and then in may, early may, they said actually, people under a0 should have moderna or pfizer and that is the policy now. our medical editor fergus walsh, there.